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Finding the Third Proportional to 4,278 and 5,409

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Solution

The third proportional to 4,278 and 5,409 is: 6,839.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,278 : 5,409 = 5,409 : x
  2. Step 2: Convert to fraction form
    4,278/5,409 = 5,409/x
  3. Step 3: Cross multiply
    4,278x = 5,409 × 5,409
  4. Step 4: Simplify right side
    4,278x = 29,257,281
  5. Step 5: Solve for x
    x = 29,257,281/4,278
  6. Step 6: Final answer
    x = 6,839.01

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Why These Related Problems?

These problems maintain the same ratio (1.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.